Electroencephalogram interface system and activation apparatus

• US 8,185,193 B2
• Filed: 06/10/2008
• Issued: 05/22/2012
• Est. Priority Date: 06/12/2007
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Morikawa, Koji, Adachi, Shinobu
• Primary Examiner(s): BORIN, MICHAEL L
• Application Number:
  US12/374,879
• Publication Number:
  US 20090187114A1
• Time in Patent Office: 1,442 Days
• Field of Search: None
• US Class Current: 600/544
• CPC Class Codes: G06F 3/015 Input arrangements based on nervous system activity detection, e.g. brain waves [EEG] detection, electromyograms [EMG] detection, electrodermal response detection

Abstract

An electroencephalogram interface system includes a biological signal detection section for detecting an electroencephalogram signal from a user and a control section for distinguishing a component of an event-related potential and causing a device to operate based on the distinguished event-related potential. An activation apparatus activates the control section and an output section for presenting a visual stimulation which flickers with a predetermined frequency based on a signal from the activation apparatus. The activation apparatus includes: a frequency analysis section for analyzing a frequency component of the electroencephalogram signal and detecting an intensity corresponding to the predetermined frequency; and a determination section for comparing the detected intensity of the predetermined frequency and a predetermined threshold, and if the intensity of the predetermined frequency is equal to or greater than a predetermined threshold, activating the control section.

Claims

1. An electroencephalogram interface system comprising:

a biological signal detection section for detecting an electroencephalogram signal from a user, and a control section for distinguishing a component of an event-related potential which is contained in the electroencephalogram signal and causing a device to operate based on the distinguished event-related potential, wherein,

the electroencephalogram interface system further comprises;

an activation apparatus for activating the control section from an inactive state in which the control section is not processing electroencephalogram signals, and

an output section for presenting a visual stimulation which flickers with a predetermined frequency based on a signal from the activation apparatus; and

the activation apparatus includes;

a frequency analysis section for analyzing a frequency component of the electroencephalogram signal detected by the biological signal detection section, and detecting an intensity corresponding to the predetermined frequency;

a determination section for comparing the detected intensity of the predetermined frequency and a predetermined threshold, and if the intensity of the predetermined frequency is equal to or greater than the predetermined threshold, determining that the user has been paying attention to the visual stimulation and thus activating the control section;

a biological signal analysis section for analyzing signal intensities of a plurality of frequencies contained in the electroencephalogram signal detected by the biological signal detection section;

a setting section for setting the predetermined frequency based on a result of analysis by the biological signal analysis section; and

an adjustment section for generating a signal for presenting the visual stimulation at the frequency having been set,

wherein the biological signal analysis section continuously analyzes the signal intensities of the plurality of frequencies, and sets as the predetermined frequency a frequency which is different from a frequency whose signal intensity is increasing.

2. In an electroencephalogram interface system having a biological signal detection section for detecting an electroencephalogram signal from a user and a control section for distinguishing a component of an event-related potential which is contained in the electroencephalogram signal and causing a device to operate based on the distinguished event-related potential, an activation apparatus to be used for activating the control section from an inactive state in which the control section is not processing electroencephalogram signals, wherein,

the electroencephalogram interface system further has an output section for presenting a visual stimulation which flickers with a predetermined frequency based on a signal from the activation apparatus, the activation apparatus comprising:

a frequency analysis section for analyzing a frequency component of the electroencephalogram signal detected by the biological signal detection section, and detecting an intensity corresponding to the predetermined frequency;

a determination section for determining whether the user has been paying attention to the visual stimulation or not based on the detected intensity of the predetermined frequency, and activating the control section based on a result of determination;

a biological signal analysis section for analyzing signal intensities of a plurality of frequencies contained in the electroencephalogram signal detected by the biological signal detection section;

a setting section for setting the predetermined frequency based on a result of analysis by the biological signal analysis section; and

an adjustment section for generating a signal for presenting the visual stimulation at the frequency having been set,

wherein the biological signal analysis section continuously analyzes the signal intensities of the plurality of frequencies, and sets as the predetermined frequency a frequency which is different from a frequency whose signal intensity is increasing.

3. The activation apparatus of claim 2, wherein the determination section determines whether the user has been paying attention to the visual stimulation or not based on a result of comparison between the intensity of the predetermined frequency and a predetermined threshold.

4. The activation apparatus of claim 3, wherein, when the intensity of the predetermined frequency is equal to or greater than the predetermined threshold, the determination section determines that the user has been paying attention to the visual stimulation and activates the control section.

5. The activation apparatus of claim 2, wherein, the output section outputs a video content as a result of operation of the device;

and

the activation apparatus further comprises;

a content analysis section for analyzing signal intensities of a plurality of frequencies contained in the vide content;

a setting section for setting the predetermined frequency based on a result of analysis by the content analysis section; and

an adjustment section for generating a signal for presenting the visual stimulation at the frequency having been set.

6. The activation apparatus of claim 2, wherein,

the output section has a screen for presenting a video content which is output as a result of operation of the device;

and

the activation apparatus further comprises;

a content analysis section for analyzing signal intensities of a plurality of frequencies contained in the vide content;

a biological signal analysis section for analyzing signal intensities of a plurality of frequencies contained in the electroencephalogram signal detected by the biological signal detection section;

a setting section A for, among the analyzed signal intensities of the respective frequencies, notifying a frequency having a signal intensity which is higher than a predetermined threshold;

a setting section B for, based on a result of analysis by the content analysis section, notifying a frequency at which the video content changes; and

an adjustment section for setting as the predetermined frequency a frequency which is different from the frequency notified by the setting section A and from the frequency notified by the setting section B.

7. The activation apparatus of claim 5, wherein,

the output section has a screen for presenting a video content which is output as a result of operation of the device;

and

the adjustment section presents the visual stimulation by flickering a portion of the screen at the predetermined frequency.

8. The activation apparatus of claim 5, wherein,

the output section includes a light source for presenting the visual stimulation and a screen for presenting a video content which is output as a result of operation of the device;

and

the adjustment section presents the visual stimulation by flickering the light source at the predetermined frequency.

9. The activation apparatus of claim 5, wherein the determination section activates the control section, and causes the control section to allow the device to operate based on the distinguished event-related potential and causes the adjustment section to stop presenting the visual stimulation.

10. An electroencephalogram interface system for detecting an electroencephalogram signal from a user and controlling an operation of at least one device based on the electroencephalogram signal, comprising:

a biological signal detection section for detecting an electroencephalogram signal from a user;

an output section being provided corresponding to the at least one device and having a light source for presenting a visual stimulation; and

an activation apparatus for controlling activation of the at least one device from an inactive state in which electroencephalogram signals are not being processed, and stopping of an operation thereof,

wherein the activation apparatus includes;

a frequency analysis section for analyzing a frequency component of the electroencephalogram signal detected by the biological signal detection section, and detecting an intensity corresponding to the predetermined frequency;

a determination section for determining whether the user has been paying attention to the visual stimulation or not based on the detected intensity of the predetermined frequency, and activating the at least one device or stopping an operation thereof based on a result of determination;

a biological signal analysis section for analyzing signal intensities of a plurality of frequencies contained in the electroencephalogram signal detected by the biological signal detection section;

a setting section for setting the predetermined frequency based on a result of analysis by the biological signal analysis section; and

an adjustment section for generating a signal for presenting the visual stimulation at the frequency having been set,

wherein the biological signal analysis section continuously analyzes the signal intensities of the plurality of frequencies, and sets as the predetermined frequency a frequency which is different from a frequency whose signal intensity is increasing.

11. A method to be used in an electroencephalogram interface system for controlling a device based on an electroencephalogram signal from a user, comprising the steps of:

presenting a visual stimulation flickering with a predetermined frequency;

detecting an electroencephalogram signal from a user;

analyzing a frequency component of the detected electroencephalogram signal, and detecting an intensity corresponding to the predetermined frequency;

comparing the detected intensity of the predetermined frequency and a predetermined threshold;

activating the device from an inactive state in which electroencephalogram signals are not being processed if the intensity of the predetermined frequency is equal to or greater than a predetermined threshold;

analyzing signal intensities of a plurality of frequencies contained in the electroencephalogram signal detected by the biological signal detection section;

setting the predetermined frequency based on a result of analysis by the biological signal analysis section; and

generating a signal for presenting the visual stimulation at the frequency having been set,

wherein the analyzing step continuously analyzes signal intensities of the plurality of frequencies, and sets as the predetermined frequency a frequency which is different from a frequency whose signal intensity is increasing.

12. In an electroencephalogram interface system having a biological signal detection section for detecting an electroencephalogram signal from a user and a control section for distinguishing a component of an event-related potential which is contained in the electroencephalogram signal and causing a device to operate based on the distinguished event-related potential, a computer program embodied in a computer-readable medium and to be executed in an activation apparatus used for activating the control section from an inactive state in which the control section is not processing electroencephalogram signals, wherein,

the electroencephalogram interface system further includes an output section for presenting a visual stimulation which flickers with a predetermined frequency based on a signal from the activation apparatus, the computer program comprising the steps of:

analyzing a frequency component of the electroencephalogram signal detected by the biological signal detection section, and detecting an intensity corresponding to the predetermined frequency;

determining whether the user has been paying attention to the visual stimulation or not based on the detected intensity of the predetermined frequency, and activating the control section based on a result of determination;

analyzing signal intensities of a plurality of frequencies contained in the electroencephalogram signal detected by the biological signal detection section;

setting the predetermined frequency based on a result of analysis by the biological signal analysis section; and

generating a signal for presenting the visual stimulation at the frequency having been set,

wherein the analyzing step continuously analyzes signal intensities of the plurality of frequencies, and sets as the predetermined frequency a frequency which is different from a frequency whose signal intensity is increasing.